Efficiency Of Energy Transfer Between Cr/sup 3+/and Tm/sup 3+/ In Scandium And Aluminum Garnets

Abstract

I(t) = A exp[-t/r] T = 1 M K r. = I 7 Ins p ( C r 1 ' ) = 2 5x10'" tom/cc p('l'rn")=R OxIOm i m s l w Studies of transfer efficiences for Cr3+ to Tm3+ in YAG, YSAG, and YSGG are reported. There is essentially no efficiency reduction in YAG when the Cr3+ concentration is decreased to 1%, which reduces thermal loading effects. The optimum Tm3+ concentration is above 4%. In sharp contrast to Cr:Nd systems, more efficient transfer is obtained in YAG rather than the scandium garnets.